US6379705B1 - Stable multi-unitary pharmaceutical preparations containing substituted benzimidazoles - Google Patents

Stable multi-unitary pharmaceutical preparations containing substituted benzimidazoles Download PDF

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US6379705B1
US6379705B1 US09/580,551 US58055100A US6379705B1 US 6379705 B1 US6379705 B1 US 6379705B1 US 58055100 A US58055100 A US 58055100A US 6379705 B1 US6379705 B1 US 6379705B1
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pharmaceutical preparations
layer
preparations according
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alkaline
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Carla Patricia Goncalves Mendes
Maria Julia Caeiro Ramalho de Oliveira
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LABORATORIO MEDINFAR-PRODUTOS FARMACEUTICOS SA
Laboratorio Mendifar-Produtos Farmaceuticos SA
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
    • A61K31/4427—Non condensed pyridines; Hydrogenated derivatives thereof containing further heterocyclic ring systems
    • A61K31/4439—Non condensed pyridines; Hydrogenated derivatives thereof containing further heterocyclic ring systems containing a five-membered ring with nitrogen as a ring hetero atom, e.g. omeprazole
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/4164—1,3-Diazoles
    • A61K31/4184—1,3-Diazoles condensed with carbocyclic rings, e.g. benzimidazoles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
    • A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
    • A61K9/5073—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals having two or more different coatings optionally including drug-containing subcoatings
    • A61K9/5078—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals having two or more different coatings optionally including drug-containing subcoatings with drug-free core

Definitions

  • the present invention relates to new oral multi-unitary pharmaceutical preparations containing substituted benzimidazoles being inhibitors of H + , K + -ATPase (i.e. omeprazole, lansoprazole, pantoprazole, leminoprazole and pariprazole) or their pharmaceutically acceptable salts.
  • substituted benzimidazoles being inhibitors of H + , K + -ATPase (i.e. omeprazole, lansoprazole, pantoprazole, leminoprazole and pariprazole) or their pharmaceutically acceptable salts.
  • the preparations comprise a spherical inert core, constituted by starch and sugar, coated with a layer containing at least one substituted benzimidazole in the micronized form, which is mixed with pharmaceutically acceptable inert excipients, whose proportions are suitable for allowing the disaggregation of the dosage forms and the intended dissolution of the active ingredient(s), this layer in turn being coated with an insulating layer of an exclusively polymeric nature and of suitable thickness, applying lastly an external, gastroresistant or enteric layer of suitable thickness, in order to guarantee the integrity of the product until it reaches the proximal part of the small intestine, where the formulation will be disaggregated to facilitate the absorption of the substituted benzimidazolic compounds.
  • the pellets produced according to the invention are placed in hard gelatine capsules and administered to patients in this form.
  • the invention does not require the stabilization of the benzimidazolic compounds using any of the strategies or processes which already belong to the state of the art.
  • the pharmaceutical products produced in this way are free from organic solvents and/or the impurities generally associated to them, because the application of the different layers exclusively requires aqueous solvents.
  • This aspect constitutes a technological advantage, since the manufacturing process is incomparably safer, because there is no toxicity risk to operators or explosion risks and moreover it is more ecological, because there is no possibility of environmental contamination caused by organic solvents leaking into the atmosphere.
  • the products obtained are stable for a period of time compatible with pharmaceutical requirements, and they present gastroresistance and dissolution characteristics generally adapted to the period of validity established for pharmaceutical products (i.e. 3 years).
  • Benzimidazolic compounds such as omeprazole (5-methoxy-2(((4-methoxy-3,5-dimethyl-2-pyridinyl)-methyl-sulfinyl)1H-benzimidazole (EP-B1-0005129), lansoprazole (2-((3-methyl-4-(2,2,2-trifluoroetoxy)-2-piridyl)methyl(sulfinyl 1H-benzimidazole) (U.S. Pat. No. 4,628,098), pantoprazole (U.S. Pat. No.
  • leminoprazole and pariprazole are anti-ulcerous substances known for decreasing gastric acid secretion (Olbe L., et al., Gastroenterol., 83:193-198 (1982); Saton H. et al., Jpn. J. Pharmacol. 40 (suppl.), 226 (1986); Saton H, et al., J.Pharmacol. Exp. Ther, 248 (2), 806-815 (1989), Nagaya, H, et al., J.Pharmacol. Exp.
  • DE-A1-3046 559 describes a way to coat a pharmaceutical dosage form with an insoluble layer containing microcrystalline cellulose and with a second enteric layer. This preparation did not allow the desirable release of omeprazole in the small intestine.
  • U.S. Pat. No. 2,540,979 describes a preparation coated with an enteric layer combined with a first coating of a water-insoluble wax. This preparation was shown to be inadequate for omeprazole because the direct contact of the cellulose acetophtalate (CAP) with the omeprazole caused its degradation.
  • CAP cellulose acetophtalate
  • DE-A1-1 204 363 describes a pharmaceutical dosage form which has three layers but cannot be used for omeprazole because it does not allow the fast release of omeprazole in the small intestine, as is desirable.
  • DE-A1-1 204 363 concerns a coating that allows the delivery of the active ingredient in the ileum, which is not desirable in the case of omeprazole.
  • DE-A1-1 617 615 describes a dosage form which likewise cannot be applied to omeprazole because it is dissolved very slowly in the intestinal juice.
  • GB 2 189 698 A and U.S. Pat. No. 4,786,505 propose the mixture of a mass of cellulose derivatives and disaggregants, with an appropriate amount of omeprazole and alkaline salts, in order to obtain, by extrusion, a core which is spheronized and coated with gastroresistant agents dissolved in alcoholic solutions also containing considerable percentages of acetone.
  • the pellets obtained are extremely irregular in shape and dimensions, which hinders the process of filling the gelatine capsules, and this can have repercussions on a relative dispersion of the average weight of the capsules and of the respective dosage.
  • any of the phases of preparation of the pharmaceutical dosage forms means that the quantity thereof in the final product will have to be determined, as well as the quantity of the impurities that may be associated to them and may be potentially dangerous for the health, which makes them highly inadvisable.
  • U.S. Pat. No. 5,232,706 describes omeprazole dosage forms coated with one or more layers containing water-soluble alkaline excipients mixed with a second alkaline compound.
  • U.S. Pat. No. 5,385,739 and FR-A-2 692 146 describe pharmaceutical gastroprotected dosage forms containing omeprazole wherein the active substance is diluted with mannitol and applied to an inert core.
  • the dosage form is prepared in a conventional coating pan, which is a slow process and requires the use of organic solvents which are noxious to the operator and dangerous to handle. Besides, with the pellets obtained, with a wrinkled surface, it is difficult to fill capsules of uniform weight. Finally, the pellets marketed by the applicant of these patents did not observe the gastroresistance and dissolution criteria required for their use during the period of validity established for pharmaceutical dosage forms.
  • U.S. Pat. No. 5,399,700 concerns the stabilization of benzimidazolic derivative compounds as cyclodextrin inclusion complexes.
  • U.S. Pat. No. 5,690,960 concerns dosage forms containing magnesium omeprazole salts with more than 70% crystallization.
  • U.S. Pat. No. 5,708,017 concerns an oral formulation in the form of a paste in an oily vehicle, containing a proton pump inhibitor, intended for the treatment of gastric ulcers in humans and animals.
  • U.S. Pat. No. 5,714,504 relates to pharmaceutical formulations for oral administration containing alkaline salts of the ( ⁇ ) enantiomer of omeprazole.
  • WO 96/01623 relates to omeprazole tablets obtained from gastroresistant multi-unitary dosage forms, which are used to prepare tablets in the presence of appropriate excipients.
  • WO 97/12581 relates to oral formulations of omeprazole obtained by compression of pellets containing benzimidazoles, thereby obtaining micro-tablets which are subsequently coated and placed in hard gelatine capsules.
  • WO 98/53803 relates to the specific use of a quality of HPMC in the manufacture of pharmaceutical dosage forms containing omeprazole.
  • WO 98/19668 relates to an omeprazole formulation with pulsatile kinetics which simulates a bolus for a once-a-day dosage form.
  • WO 98/50019 relates to oral dosage forms containing omeprazole or lansoprazole, inside hard gelatine capsules which are subsequently coated with gastroresistant or enteric polymers.
  • U.S. Pat. No. 4,689,333 describes pharmaceutical compositions for the prevention or treatment of ulcers containing an effective amount of lansoprazole or a pharmaceutically acceptable salt thereof.
  • U.S. Pat. No. 5,026,560 relates to spherical pellets consisting of a core coated with a binding agent which is coated with a mixture of powders containing lansoprazole, HPMC of low viscosity and magnesium or calcium carbonates as alkaline agents.
  • the manufacturing process used was “powder coating”, which is difficult and laborious and therefore makes the product very expensive.
  • U.S. Pat. No. 5,045,321 relates to dosage forms for the production of pellets or coated tablets which comprise a uniform mixture of lansoprazole with at least one alkaline inorganic salt. There is no reference to protective and/or enteric coatings in the claims of the patent.
  • U.S. Pat. No. 5,093,132 claims a stable oral dosage form containing lansoprazole or a pharmaceutically acceptable salt thereof mixed uniformly with an alkaline inorganic salt as a stabilizing agent. Only a simple reference is made to the use of an enteric coating.
  • EP 0 589 981 relates to oral dosage forms of pantoprazole as tablets or pellets which use alkaline and/or alkaline-earthy metallic salts for stabilization of the active ingredient and which use organic solvents (i.e. isopropanol) in the technological process for the production of the pharmaceutical formulations.
  • organic solvents i.e. isopropanol
  • WO 97/12580 describes oral dosage forms of substituted benzimidazoles, preferably pantoprazole, obtained by compression of pellets containing benzimidazole, thereby producing micro-tablets that are subsequently coated and placed inside hard gelatine capsules.
  • the present invention concerns stable multi-unitary dosage forms of gastroresistant pellets for oral administration, free from residues of organic solvents and the impurities associated to them, containing a substituted benzimidazole or a pharmacologically acceptable salt thereof, or associations of substituted benzimidazoles or of their pharmaceutically acceptable salts.
  • the formulations do not comprise any of the methods of stabilization of benzimidazoles already known from the state of the art and they are the first ones whose manufacturing process involves the use of a fluid bed equipment with an inner partition device (wurster), and not extrusion/spheronization techniques, rotogranulation, “powder coating” or coating in conventional coating pans.
  • the present invention describes pellet formulations composed of an inert core coated with a layer which contains the active ingredient(s), coated in turn with an intermediate layer of a minimum thickness of 15 ⁇ m and with a final external gastroresistant or enteric layer of a minimum thickness of 30 ⁇ m.
  • the thickness of the intermediate layer is decisive to the stability of the final product and it prevents the incorporation of alkaline and/or alkaline-earthy metallic salts into the mixture containing the benzimidazolic compounds, as well as into the insulating layer.
  • the pellets obtained have spherical symmetry and their surface is perfectly flat when observed by scanning electronic microscopy (S.E.M.), contrary to the other formulations on the market that are obtained by other methods.
  • the fact that the products are manufactured without the use of organic solvents makes them safer for patients and for operators who manufacture and handle them.
  • the manufacturing process does not cause environmental pollution problems, which are becoming increasingly essential to avoid, and this is another of the aspects that differentiate these formulations from those belonging to the state of the art.
  • the process for manufacturing these new formulations has technical as well as economic advantages. In fact, all the stages of the manufacturing process use the same equipment, which represents less contact for the operator with the product, contrary to what happens with the other described processes which require the transfer of the pellets from the extruder/spheronizer to the coating pans or fluid bed equipments in order to be coated.
  • the present invention seeks to reduce the production costs of these products in order that they can be used on a large scale all over the world.
  • the present invention describes multi-unitary pharmaceutical dosage forms containing a substituted benzimidazole (omeprazole, lansoprazole or pantoprazole, leminoprazole or pariprazole) or a salt thereof, or associations of benzimidazoles or their salts, constituted by a succession of layers arranged around an inert, spherical core, prepared in a fluid bed equipment with an inner partition device (wurster).
  • the component elements of the dosage form are:
  • the inert cores of dimensions of 600-710 ⁇ m, 710-850 ⁇ m or 850-1000 ⁇ m, constituted by pharmaceutically acceptable inert excipients are coated with a layer containing at least one benzimidazole or its salts, mixed with pharmaceutically acceptable inert excipients, so that this layer is quickly disaggregable.
  • This layer is then coated with an insulating layer of a strictly polymeric nature, of a minimum thickness of 15 ⁇ m, and finally this layer is coated with an enteric coating layer of a minimum thickness of 30 ⁇ m.
  • omeprazole and lanzoprazole pellets were prepared (i.e. 400,000 capsules/batch), which were placed inside hard gelatine capsules, which were in turn stored in polyamide/aluminium/PVC blisters sealed with aluminium foil of 25 ⁇ m.
  • the blisters were incubated in climatic chambers at 25° C. and 60% relative humidity (atmospheric conditions) and 40° C. and 75% relative humidity (accelerated assays). The following parameters were periodically determined: dosage, gastroresistance, dissolution and level of impurities.
  • FIG. 1 shows a graph of the dosage, gastroresistance and dissolution results obtained for omeprazole pellets stored inside blisters and kept at 40° C. and 75% relative humidity (accelerated assays) for 9 months.
  • the omeprazole content is never lower than 95%, which is the minimum amount generally admissible for the amount of active ingredient in pharmaceutical forms during the period of validity.
  • the gastroresistance value obtained for the period during which the assay was carried out was never lower than 85%, which is the minimum percentage generally accepted for gastroresistant formulations during the period of validity.
  • FIG. 4 shows a graph of the dosage, gastroresistance and dissolution results obtained for lansoprazole pellets stored inside blisters and kept at 25° C. and 60% relative humidity (assays in real time or under atmospheric conditions) for 12 months.
  • the lansoprazole content is never lower than 95%, which is the minimum amount generally admissible for the dosage of active ingredient in pharmaceutical forms during the period of validity.
  • the gastroresistance value obtained for the period during which the assay was carried out was never lower than 85%, which is the minimum percentage generally accepted for gastroresistant formulations during the period of validity.
  • the inert cores have dimensions of 600-710 ⁇ m, 710-850 ⁇ m, or 850-1000 ⁇ m, according to the benzimidazole potency that is intended in the final product.
  • the inert cores are constituted by starch (10-30%) and sucrose (60-90%), but can also contain glucose, lactose, mannitol or any other pharmaceutically acceptable inert excipients. With solid consistency and spherical symmetry, the inert cores are obtained from sucrose particles by coating them with successive layers of sucrose and cornstarch.
  • the final product must contain less than 4% humidity.
  • the particles must be selected in a relatively narrow range of granulometry, so that the pellets obtained at the end are of a uniform dimension.
  • the inert cores should not exceed 850 ⁇ m, so that gelatine capsules of a relatively small dimension can be used, which helps the patient to adhere to the therapy being followed.
  • the inert cores can be obtained commercially and do not constitute the aim of the present invention.
  • the active layer is applied to the inert core and it contains at least one micronized benzimidazole (i.e. omeprazole, lansoprazole, pantoprazole, leminoprazole or pariprazole) or its pharmacologically acceptable salts and excipients that are also pharmaceutically acceptable, for example surfactant agents, such as sodium trilaurylphosphate, sodium dodecyl sulfate, sodium tridecylethoxylate, sodium myristylsulfate, or, preferentially, fatty acids of sorbitan esters, such as glycerol polyethyleneglycol oxystearate (Cremophor® of BASF Corporation), which increase the wettability of the benzimidazolic compounds; binding agents of a polymeric nature, such as hydroxymethylpropylcellulose (Pharmacoat® of Shinetsu; Methocel® of Colorcon), hydroxypropylcellulose (Klucel® of Hercules
  • the mixture that constitutes the layer also contains sodium tetraborate to improve the solubility and stability of the benzimidazoles.
  • sodium starch glycolate (Explotab® of Mendell, Primogel® of Generichem), pregelatinized starch (Starch 1500), microcrystalline cellulose (Avicel of FMC), sodic or calcic carboxymethylcellulose or sodium alginate.
  • Lubricant agents such as magnesium or calcium stearate, or preferentially talc, should be added, in order to decrease the friction between the particles.
  • the suspension containing the mixture of the ingredients is prepared exclusively in water.
  • anti-foaming agents such as simethicone
  • a form which is easily dispersible in water in the form of an emulsion containing not less than 85% polydimethylsiloxane
  • the substances previously mentioned are mixed with the active ingredient in an aqueous solution, are atomized on the inert cores under suitable conditions, producing a uniform layer of a thickness of between 150 and 250 ⁇ m.
  • An insulating layer is applied to the active layer in order to separate the layer containing the benzimidazole(s) from the enteric coating layer.
  • gastroresistant polymers generally have free carboxyl groups with acidic characteristics, meaning that if they were to come into direct contact with the benzimidazoles they would cause the degradation thereof. For this reason, an insulating layer should be inserted between the active layer and the enteric coating layer.
  • the insulating layer contains binding agents of a polymeric nature which, by virtue of the evaporation of the solvent (i.e. demineralized water), form a protective layer.
  • the binding agents of the insulating layer should be chosen among hydroxypropylmethylcellulose (Pharmacoat® of Shinetsu; Methocel® of Colorcon), hydroxypropylcellulose (Klucel® of Hercules), hydroxymethylcellulose, hydroxyethylcellulose (Natrosol® of Hercules or Cellosize® of Union Carbide Corporation), methylcellulose (Methocel® A of Colorcon), ethylcellulose (Aquacoat® of FMC or Surealease® of Colorcon), polyvinylpyrrolidone (Povidone® of GAF Corp., Kollidon® of BASF), polyethylene glycols, etc.
  • the dispersion obtained is applied to the granules already containing the active ingredient layer.
  • the thickness of this layer will not be less than 15 ⁇ m.
  • Experimentally it was ascertained that when this layer is not thick enough to suitably protect the layer containing the active ingredient(s) from contact with the enteric coating layer, the product is degraded quickly and darkens, and the gastroresistance of the final product quickly reaches values lower than 85%.
  • the nature and thickness of this intermediate layer was found to be decisive to the stability of the final product.
  • the composition of this layer of a strictly polymeric nature, provided that it is of appropriate thickness, prevents the incorporation of alkaline and alkaline-earthy metallic salts into the intermediate layer in order to ensure the stability of the product.
  • the enteric coating layer is applied to the insulating layer and it contains anionic copolymers of methacrylic acid and ethyl acrylate (Eudragit® L30D, Eudragit® L30D-55, Eudragit® L100-55 of Rohm & Hass), or latex of cellulose acetophtalate (CAP), such as Aquateric® of FMC, pharmaceutically acceptable plasticizers, such as triethylcitrate (Citroflex®-2), tributylcitrate (Citroflex®-4), acetyltributylcitrate (Citroflex®-A4), dibutyl sebacate (DBS), diethylphtalate (DEP), acetylated monoglyceride (Myvacet® 9-40), polyethylene glycols or 1,2-propylene glycol, and possibly a lubricant such as talc or colloidal silicon dioxide (Aerosil® 200 of Degus
  • the gastroresistant film coats each granule completely and makes the dosage form insoluble in acid media, but quickly disintegrable for neutral and alkaline pH values, as in the case of the fluids present in the proximal fraction of the small intestine, where the dissolution and the absorption of the benzimidazole(s) will occur.
  • the thickness of this layer should be not be less than 30 ⁇ m, in order to guarantee effective protection.
  • the final product is sieved in rooms with controlled humidity and temperature, and placed in hard gelatine capsules.
  • the dosage forms of the present invention are multi-unitary formulations in the form of pellets characterized by: a) a spherical inert core coated with several concentric layers which results in a product of spherical symmetry, b) a first layer of a thickness of 150-250 ⁇ m, applied to the inert core, containing at least one benzimidazole or a pharmaceutically acceptable salt thereof, mixed with inert substances that are also pharmaceutically acceptable, c) a second layer (intermediate layer), of a strictly polymeric nature and a minimum thickness of 15 ⁇ m, and d) a third layer (the outside layer), constituted by a gastroresistant or enteric polymer, of a minimum thickness of 30 ⁇ m.
  • the formulations are characterized by the complete absence of residues of organic solvents and the impurities associated to them, a characteristic which, among others, distinguishes them from the other formulations on the market.
  • the dosage forms produced by extrusion/spheronization methods are completely outside the scope of the present invention, because the pellets produced have preponderantly axial symmetry, whereas the dosage forms of the present invention have spherical symmetry, as well as other differences of a structural nature (number of layers, presence of an inert core from which the growth of the pellet begins during its preparation, etc.).
  • the pharmaceutical formulations of the present invention take the form of pellets with which hard gelatine capsules are filled.
  • the preparation of the pellets is processed as follows. For the preparation of the layer containing the active substance(s) (1st layer or active layer), a portion of demineralized water was heated up to 85-90° C. and then hydroxypropylmethylcellulose (HPMC) was dispersed in it. In another portion of demineralized water, glycerol polypropyleneglycol oxystearate, sodium tetraborate, the simethicone emulsion, sodium starch glycolate and, finally, benzimidazole(s) were dispersed. When the suspension became uniform it was mixed with the HPMC dispersion after cooling to about 35° C. This last suspension was homogenized by shaking and applied to the inert cores (710-850 ⁇ m or 850-1000 ⁇ m). After the application of the suspension, the pellets were dried so that their temperature did not exceed 50° C.
  • HPMC
  • demineralized water was heated up to 85-90° C. After this temperature was reached, HPMC was added and homogenized by shaking, until total dispersion was achieved. The dispersion was cooled to room temperature and applied to the product already containing the benzimidazolic layer. This operation is extremely delicate, because it must be guaranteed that the fluidization of the bed ensures the homogenous coating of all the pellets, with a film of regular thickness (which should not be less than 15 ⁇ m).
  • the gastroresistant or enteric coating layer (3rd layer or external layer) was prepared by mixing the demineralized water with the simethicone emulsion, followed by the addition of triethylcitrate and, finally, the copolymer of methacrylic acid. The dispersion was then homogenized for a few minutes and applied to the pellets already coated with the intermediate layer.
  • the amount of the active ingredient (mg of omeprazole/g of pellets), as well as the gastroresistance (%) and dissolution parameters of the formulations, were determined.
  • the objective established for this invention was the obtention of dosage forms with the following characteristics: amount of active ingredient ⁇ 85 mg/g of pellets, gastroresistance ⁇ 95% and dissolution ⁇ 85%, in order to establish the following specification limits (which should be maintained throughout the period of validity of the product): amount of active ingredient ⁇ 80.75 mg/g of pellets, gastroresistance ⁇ 85%, dissolution ⁇ 75%.
  • Example 2 The dosage form illustrated in Example 2 is similar to that of Example I, but the amount of enteric polymer was increased (3rd layer). This change was not enough to significantly improve the gastroresistence of the dosage form.
  • Examples 3 and 4 illustrate dosage forms wherein, preponderantly, the amount of gastroresistant polymer was increased, but their gastroresistance do not reached the intended levels.
  • Example 5 illustrates a formulation wherein the amount of enteric polymer was duplicated. At the same time, the thickness of the intermediate layer was increased slightly. Using this strategy it was possible to obtain pellets with the intended gastroresistance. However, the thickness of the gastroresistant layer seems to have a negative influence on the dissolution of the formulation.
  • Example 6 illustrates a formulation wherein the amount of hydroxypropylmethylcellulose used in the 2nd layer was doubled and the amount of gastroresistant polymer used was the same as in Example 2. Under these conditions, a gastroresistance value of 96.2% and a dissolution value of 93.3% were obtained.
  • Example 7 illustrates a dosage form wherein it was investigated whether maintaining the thickness of the 2nd layer made it possible to further reduce the amount of gastroresistant polymer to be applied.
  • the results obtained in the gastroresistance and dissolution assays show that it is not advisable to reduce the amount of gastroresistant polymer beyond the values used in Examples 2 and 6.
  • Examples 1-4 describe dosage forms which are executable from a technological point of view, but which do not obey the other criteria required for the type of dosage form intended to be developed.
  • Examples 5-10 describe dosage forms that obey the established criteria (i.e. GR ⁇ 85% and dissolution ⁇ 75%).
  • the dosage forms illustrated in Examples 5-7 are economically not very advantageous, because the yield for application of the 1st layer, the one that contains omeprazole, was still relatively low (i.e. about 90%), taking into account the high price of this active ingredient.
  • Examples 8-10 constitute steps for optimizing the dosage forms in order to improve the yield of the industrial process, as a way of making it economically more advantageous.
  • the present invention also relates to the preparation of other omeprazole multi-unitary dosage forms, of greater potency (i.e. 140 ⁇ 10 mg of omeprazole/g of pellets), for treatment with higher dosages (i.e. 40 mg/capsule), also using hard gelatine capsules of small dimensions for increased patient comfort.
  • inert cores of smaller dimensions are used (600-710 ⁇ m). Two Examples of these formulations are presented as follows:
  • Example Example Example COMPOSITION 13 14 15 (g) (g) (g) Inert cores 1000.0 1000.0 1000.0 Active layer Lansoprazole 140 140 140.0 Glycerol polyethyleneglycol 8.3 8.3 8.3 oxystearate Sodium starch glycolate 4.0 4.0 4.0 Hydroxypropylmethylcellulose 56.3 56.3 56.3 Sodium tetraborate 1.5 1.5 1.8 Emulsion 30% Simethicone 0.9 1.3 2.0 Talc — — — Insulating layer Hydroxypropylmethylcellulose 80.0 80.0 80.0 80.0 Gastroresistant layer Copolymer of methacrylic acid 225.0 225.0 225.0 Triethylcitrate 22.5 22.5 Emulsion 30% Simethicone 1.5 1.5 1.5 TOTAL 1540.0 1540.4 1541.4 Assay mg/g (theoretical value) 90.9 9
  • the present invention also applies to the active ingredient pantoprazole, with which multi-unitary dosage forms were also developed similar to the ones obtained for the other substituted benzimidazoles (omeprazole and lansoprazole).
  • One Example of this application is presented below.
  • the present invention can extends its application to other substituted benzimidazoles with therapeutic interest, for example leminoprazole and/or pariprazole. It is also applicable to substituted benzimidazole salts, benzimidazolic associations or pharmaceutically acceptable salts thereof.
  • the gastroresistance assays were performed by submitting the dosage forms, for 2 hours, to the action of an acidic incubation medium of pH ⁇ 1.2, at 37° C. ⁇ 0.5° C., with constant mixing at 100 r.p.m. ⁇ 4 r.p.m., using the dissolution equipment described by USP.
  • the dissolution assays were performed by submitting the dosage forms, for 2 hours, to the action of an acidic incubation medium of pH ⁇ 1.2, at 37° C. ⁇ 5° C., with constant mixing at 100 r.p.m. ⁇ 4 r.p.m., followed by the addition a dissolution incubation medium, maintaining the same conditions for 30 min, using the dissolution equipment described by USP.
  • the dosage forms of the present invention present good stability during a long period of storage (i.e. at least 3 years) and present gastroresistance parameters suitable for the length of time that the product stays in the stomach, being quickly dissolved as soon as it reaches the proximal portion of the small intestine.
  • the formulations should present the following characteristics:
  • An inert core of spherical symmetry constituted by pharmaceutically acceptable inert excipients, which serves as the support on which the remaining elements of the formulation are deposited.
  • a layer containing at least one benzimidazole i.e. omeprazole, lansoprazole or pantoprazole or other substituted benzimidazoles of therapeutic interest
  • benzimidazole i.e. omeprazole, lansoprazole or pantoprazole or other substituted benzimidazoles of therapeutic interest
  • pharmaceutically acceptable inert excipients whose properties guarantee the disaggregation of the formulation and the dissolution of the active ingredient in the chosen site.
  • An enteric coating layer generally constituted by an acrylic polymer, of a minimum thickness of 30 ⁇ m, possibly in the presence of a plasticizer and/or an anti-foaming agent, insoluble at the gastric pH and easily disaggregable at the pH of the proximal part of the small intestine.
  • the dosage forms of the present invention are stable in terms of dosage as well as in terms of the other tested parameters (i.e. gastroresistance, dissolution and impurities).
  • the process used to manufacture the products is economically more advantageous than the other inventions which belong to the current state of the art, and it also presents novelty as regards its applications.
  • the technological process used is incomparably safer than the ones already described, since it does not require the use of organic solvents, with a toxicity risk to operators or an explosion risk.
  • the pharmaceutical dosage form itself is safer, since there are no residues of organic solvents or the impurities inherent to them in the finished products, which is an advantage of these products in relation to the others in terms of public health.
  • aqueous polymers to ensure gastroresistance such as aqueous dispersions of cellulose acetophtalate (CAP), or other plasticizers such as tributylcitrate (Citroflex®-4), acetyltributylcitrate (Citroflex®-A4), dibutyl sebacate (DBS), diethylphtalate (DEP), monoglyceride acetylated (Myvacet® 9-40), of other aggregants such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, polyethylene glycol, polyvinylpyrrollidone, etc., of other disaggregants such as pregelatinized starch, microcrystalline cellulose, calcic or sodic carboxymethylcellulose or sodium alginate, or other surfactant agents such as sodium trilaurylsulfate, sodium tri
  • the present invention does not include formulations obtained by the classic extrusion/spheronization techniques already known from the state of the art, the products of which, in terms of qualitative and quantitative composition and also structurally, are different from the ones that the present invention intends to protect.

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EP99670010A EP1108425B1 (de) 1999-12-16 1999-12-16 Neue stabile mehreinheitliche substituierte Benzimidazole enthaltende pharmazeutische Präparate
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US20030236236A1 (en) * 1999-06-30 2003-12-25 Feng-Jing Chen Pharmaceutical compositions and dosage forms for administration of hydrophobic drugs
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US20040146558A1 (en) * 2003-01-28 2004-07-29 Kyowa Pharmaceutical Co., Ltd. Oral enteric-coated preparation
US20050191353A1 (en) * 2002-08-16 2005-09-01 Amit Krishna Antarkar Process for manufacture of stable oral multiple unit pharmaceutical composition containing benzimidazoles
US20050214371A1 (en) * 2004-03-03 2005-09-29 Simona Di Capua Stable pharmaceutical composition comprising an acid labile drug
US20050266075A1 (en) * 2004-06-01 2005-12-01 Pharmascience Inc. Omeprazole dosage form
US20060003002A1 (en) * 2003-11-03 2006-01-05 Lipocine, Inc. Pharmaceutical compositions with synchronized solubilizer release
US20060057195A1 (en) * 2002-10-16 2006-03-16 Takeda Pharmaceutical Company Limited Stable solid preparations
US20060252820A1 (en) * 2003-04-25 2006-11-09 Tetsuya Suzuki Composition for oral administration containing alkylene dioxybenzene derivative
US20070042033A1 (en) * 2003-10-01 2007-02-22 Wyeth Pantoprazole multiparticulate formulations
US20070231388A1 (en) * 2004-05-07 2007-10-04 Atlana Pharma Ag Novel Pharmaceutical Dosage Form and Manufacturing Process
US20080145421A1 (en) * 2005-04-28 2008-06-19 Eisai R&D Management Co., Ltd. Stabilized composition
US20090074859A1 (en) * 1999-11-23 2009-03-19 Mahesh Patel Solid carriers for improved delivery of active ingredients in pharmaceutical compositions
US20100173882A1 (en) * 2009-01-08 2010-07-08 Lipocine, Inc. Steroidal Compositions
US20100297226A1 (en) * 2006-06-01 2010-11-25 Dexcel Pharma Technologies Ltd. Multiple unit pharmaceutical formulation
US20110044519A1 (en) * 2008-03-13 2011-02-24 Levasseur Jr Donald P Multi-Function, Foot-Activated Controller for Imaging System
US9034858B2 (en) 2010-11-30 2015-05-19 Lipocine Inc. High-strength testosterone undecanoate compositions
US9358241B2 (en) 2010-11-30 2016-06-07 Lipocine Inc. High-strength testosterone undecanoate compositions
US9498485B2 (en) 2014-08-28 2016-11-22 Lipocine Inc. Bioavailable solid state (17-β)-hydroxy-4-androsten-3-one esters
US10561615B2 (en) 2010-12-10 2020-02-18 Lipocine Inc. Testosterone undecanoate compositions
US10835488B2 (en) 2016-06-16 2020-11-17 Dexcel Pharma Technologies Ltd. Stable orally disintegrating pharmaceutical compositions
US11077055B2 (en) 2015-04-29 2021-08-03 Dexcel Pharma Technologies Ltd. Orally disintegrating compositions
US11433083B2 (en) 2010-11-30 2022-09-06 Lipocine Inc. High-strength testosterone undecanoate compositions
US11559530B2 (en) 2016-11-28 2023-01-24 Lipocine Inc. Oral testosterone undecanoate therapy
US11707467B2 (en) 2014-08-28 2023-07-25 Lipocine Inc. (17-ß)-3-oxoandrost-4-en-17YL tridecanoate compositions and methods of their preparation and use

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WO2004066982A1 (en) * 2003-01-31 2004-08-12 Ranbaxy Laboratories Limited Stable oral benzimidazole compositions and processes for their preparation
AR045068A1 (es) * 2003-07-23 2005-10-12 Univ Missouri Formulacion de liberacion inmediata de composiciones farmaceuticas
EP1785135A1 (de) * 2005-11-10 2007-05-16 Laboratorios Del Dr. Esteve, S.A. Neue Lanzoprazol enthaltende stabilisierte galenische Formulierungen und ihre Herstellung
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US20100137271A1 (en) * 1999-06-30 2010-06-03 Lipocine, Inc. Pharmaceutical compositions and dosage forms for administration of hydrophobic drugs
US20030180352A1 (en) * 1999-11-23 2003-09-25 Patel Mahesh V. Solid carriers for improved delivery of active ingredients in pharmaceutical compositions
US20090074859A1 (en) * 1999-11-23 2009-03-19 Mahesh Patel Solid carriers for improved delivery of active ingredients in pharmaceutical compositions
US20030211147A1 (en) * 2000-09-29 2003-11-13 Cullen Daniel J. Proton pump inhibitor formulation
KR100434904B1 (ko) * 2002-05-30 2004-06-11 주식회사 대웅 안정화된 란소프라졸을 함유하는 장용성 제제
US20030228363A1 (en) * 2002-06-07 2003-12-11 Patel Mahendra R. Stabilized pharmaceutical compositons containing benzimidazole compounds
US20050191353A1 (en) * 2002-08-16 2005-09-01 Amit Krishna Antarkar Process for manufacture of stable oral multiple unit pharmaceutical composition containing benzimidazoles
US8697094B2 (en) 2002-10-16 2014-04-15 Takeda Pharmaceutical Company Limited Stable solid preparations
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US20060057195A1 (en) * 2002-10-16 2006-03-16 Takeda Pharmaceutical Company Limited Stable solid preparations
US9265730B2 (en) 2002-10-16 2016-02-23 Takeda Pharmaceutical Company Limited Stable solid preparations
US20040146558A1 (en) * 2003-01-28 2004-07-29 Kyowa Pharmaceutical Co., Ltd. Oral enteric-coated preparation
US20060252820A1 (en) * 2003-04-25 2006-11-09 Tetsuya Suzuki Composition for oral administration containing alkylene dioxybenzene derivative
US7553498B2 (en) 2003-10-01 2009-06-30 Wyeth Pantoprazole multiparticulate formulations
US20070196444A1 (en) * 2003-10-01 2007-08-23 Wyeth Pantoprazole multiparticulate formulations
US7838027B2 (en) 2003-10-01 2010-11-23 Wyeth Llc Pantoprazole multiparticulate formulations
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US20070042033A1 (en) * 2003-10-01 2007-02-22 Wyeth Pantoprazole multiparticulate formulations
US20060003002A1 (en) * 2003-11-03 2006-01-05 Lipocine, Inc. Pharmaceutical compositions with synchronized solubilizer release
US20050214372A1 (en) * 2004-03-03 2005-09-29 Simona Di Capua Stable pharmaceutical composition comprising an acid labile drug
US20050214371A1 (en) * 2004-03-03 2005-09-29 Simona Di Capua Stable pharmaceutical composition comprising an acid labile drug
US20070231388A1 (en) * 2004-05-07 2007-10-04 Atlana Pharma Ag Novel Pharmaceutical Dosage Form and Manufacturing Process
US20050266075A1 (en) * 2004-06-01 2005-12-01 Pharmascience Inc. Omeprazole dosage form
US9040564B2 (en) * 2005-04-28 2015-05-26 Eisai R&D Management Co., Ltd. Stabilized composition
US20080145421A1 (en) * 2005-04-28 2008-06-19 Eisai R&D Management Co., Ltd. Stabilized composition
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DE69925740D1 (de) 2005-07-14
DE69925740T2 (de) 2006-05-11
ATE297194T1 (de) 2005-06-15
EP1108425A1 (de) 2001-06-20
ES2244167T3 (es) 2005-12-01
PT1108425E (pt) 2005-10-31
HK1039742A1 (en) 2002-05-10
EP1108425B1 (de) 2005-06-08

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